“内容解码失败”错误时使用GZIP压缩

Question

我的web应用程序生成的飞行CSV文件，但每当我用gzip压缩，下载失败下载文件：

HTTP/1.1 200 OK 
Cache-Control: private, s-maxage=0,no-store, no-cache 
Transfer-Encoding: chunked 
Content-Type: text/csv;charset=utf-8 
Content-Encoding: gzip 
Vary: Accept-Encoding 
Server: Microsoft-IIS/7.5 
X-AspNetMvc-Version: 3.0 
Content-Disposition: attachment;filename="filename.csv" 
X-AspNet-Version: 4.0.30319 
X-Powered-By: ASP.NET 
p3p: CP="CAO PSA OUR" 
Date: Fri, 03 Feb 2012 11:27:27 GMT 

下载显示为“中断“，并在Internet Explorer中出现错误，指出”内容解码失败“。

HTTP/1.1 200 OK 
Cache-Control: private, s-maxage=0,no-store, no-cache 
Transfer-Encoding: chunked 
Content-Type: text/csv;charset=utf-8 
Server: Microsoft-IIS/7.5 
X-AspNetMvc-Version: 3.0 
Content-Disposition: attachment;filename="filename.csv" 
X-AspNet-Version: 4.0.30319 
X-Powered-By: ASP.NET 
p3p: CP="CAO PSA OUR" 
Date: Fri, 03 Feb 2012 11:23:30 GMT 

该解决方案禁用该操作的压缩，但是......为什么会发生这种情况？

干杯。

UPDATE：我用的压缩过滤器：

public class EnableCompressionAttribute : ActionFilterAttribute 
{ 
    const CompressionMode compress = CompressionMode.Compress; 
    public override void OnActionExecuting(ActionExecutingContext filterContext) 
    { 
     if (filterContext.IsChildAction) 
      return; 

     var actionAttributes = filterContext.ActionDescriptor.GetCustomAttributes(true); 
     if (actionAttributes != null && actionAttributes.Any(attr => attr is SkipCompressionAttribute)) 
      return; 

     HttpRequestBase request = filterContext.HttpContext.Request; 
     HttpResponseBase response = filterContext.HttpContext.Response; 
     String acceptEncoding = request.Headers["Accept-Encoding"]; 

     if (acceptEncoding == null || response.Filter == null) 
      return; 

     if (acceptEncoding.ToLower().Contains("gzip")) 
     { 
      response.Filter = new GZipStream(response.Filter, compress); 
      response.AppendHeader("Content-Encoding", "gzip"); 
      response.AppendHeader("Vary", "Accept-Encoding"); 
     } 
     else if (acceptEncoding.ToLower().Contains("deflate")) 
     { 
      response.Filter = new DeflateStream(response.Filter, compress); 
      response.AppendHeader("Content-Encoding", "deflate"); 
      response.AppendHeader("Vary", "Accept-Encoding"); 
     } 
    } 
} 

Answer 1

尝试：

Response.Headers.Remove("Content-Encoding"); 
Response.AppendHeader("Content-Encoding", "gzip"); 

另一个问题可能是缓存：如果哪一个客户端接受压缩的内容，但下一个客户端不，并且服务器缓存压缩数据？第二个客户会得到什么？缓存的压缩页面不会解码！

为了解决这个问题，添加另一种方法：

public override string GetVaryByCustomString(HttpContext context, string custom) 
{ 
    if (custom == "GZIP") 
    { 
     string acceptEncoding = HttpContext.Current.Response.Headers["Content-Encoding"]; 

     if (string.IsNullOrEmpty(acceptEncoding)) 
      return ""; 
     else if (acceptEncoding.Contains("gzip")) 
      return "GZIP"; 
     else if (acceptEncoding.Contains("deflate")) 
      return "DEFLATE"; 

     return ""; 
    } 

    return base.GetVaryByCustomString(context, custom); 
}